Also, the idea 30 a very complex issue regarding depression into something simple and easily understandable, and that tends to appeal to a lot of people.
答案：(A) breaks down
break down A into B 是「把 A 拆解、簡化成 B」，本句指這個說法把複雜的憂鬱議題化約成簡單易懂的東西；mixes up（弄混）、tears off（撕下）、results in（導致）都無法與後面的 into 搭配。
答對率 20%。
break down 你大概只記得兩個畫面——車子拋錨、人崩潰大哭——沒學到它在學術與說明文裡最常用的一義：把複雜的東西拆解成小部分。
break down sth into sth 指把想法或陳述拆解成較小的部分，以便理解或處理，Collins 的例句是 The report breaks down the results region by region.。本句說的正是「Blue Monday 這個說法，把憂鬱症這個複雜議題化約成簡單易懂的東西」，後半句 and that tends to appeal to a lot of people 也說明了為什麼——因為簡單，所以吸引人。
空格後面出現 into，這是最強的線索：break down A 「into」 B 的 into 是這個片語自帶的。results in 後面接的是結果本身（result in failure），不接 into；mix up 是「弄混、搞混」；tear off 是「撕下」。三者都無法與 into 形成合理搭配。做片語題時，先看空格後面有沒有介系詞，往往一眼就能篩掉大半選項。
break down A into B（把 A 分解為 B）、break down（故障、破裂）、break down in tears（崩潰痛哭）、result in（導致）、mix up（弄混）、tear off（撕下）。
The idea of Blue Monday dates back to a 2005 campaign by Sky Travel. The travel company wanted to 26 people to take January vacations, so they reached out to a psychologist. The scholar then developed an equation to find the most depressing day of the year, and it turned out to be the third Monday in January. Since then, other companies have jumped on the bandwagon to promote everything from soft drinks to new clothes as a 27 . A group in the UK even started a website devoted to "beating Blue Monday."
Many scientists, however, say there is no evidence that Blue Monday causes any more sadness than other specific days of the year. 28 , the idea of Blue Monday persists. According to psychologist Dean Burnett, people feel down in January 29 post-holiday discontent, and the Blue Monday claim makes it seem like there are scientific reasons for this. Also, the idea 30 a very complex issue regarding depression into something simple and easily understandable, and that tends to appeal to a lot of people.